It is not enough to trust them to do their best. Journalists should be in a structure that strongly incentivizes telling the truth and strongly punishes false information. It is very unclear that US media outlets, almost all of which are highly politicized, have this property.
Really?
https://en.wikipedia.org/wiki/Dan_Rather#Killian_documents
https://en.wikipedia.org/wiki/Brian_Williams#Iraq_War_helico...
https://en.wikipedia.org/wiki/Juan_M._Thompson#Reporting_sca...
https://en.wikipedia.org/wiki/Jayson_Blair#Plagiarism_and_fa...
https://en.wikipedia.org/wiki/Lara_Logan#Benghazi_report_apo...
https://www.timeout.com/chicago/tv/how-a-horrible-decision-c...
https://en.wikipedia.org/wiki/Michael_Finkel
https://en.wikipedia.org/wiki/Stephen_Glass#The_New_Republic
The CNN fish feeding story was deliberately created by zooming film at the point the Japanese leader dumped their fish food, then zooming out again to show Trump dumping his, then writing text to support the fake narrative.
The Mark Duggan 'unarmed' headline was immediately followed by a story which revealed the suspect was armed.
The retracted CNN Russia stuff might have simply have been gross incompetence though so your point does apply there.
Would the guardian be caught dead printing these? https://www.mediamatters.org/blog/2016/08/17/breitbart-news-...
Or have they peddled lies as big as these ones? https://www.snopes.com/climatology-fraud-global-warming/ https://www.snopes.com/immigrants-california-wildfires/ https://www.snopes.com/planned-parenthood-satanists/
Look, maybe the media has a left bias. And it's plausible that right-leaning sources face more skepticism. That's not fair. But the reason Breitbart gets flack is because they really are that terrible.
But relying on social networks for news drops both careful research AND independent review, which is a step backward, not forward.
I don't trust what CNN says about Steve Bannon or Roy Moore, but just hearing what they say about themselves in their own words is enough for me to know I don't belong in their camp.